About the only "positive" BG ID's that can be made in a crisis are:
1) Unidentified person with a threatening weapon pointed at you and who has not IDed themself as a LEO
2) ID10T walking and randomly shooting with a weapon of some sort.
Just about anything else can be hard to discern for a CCW holder or a LEO.
Weapons out not pointed at me my first thoughts are to get my family to cover.